mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 14:12:25 +07:00
f12b76e56a
The root complexes used to access off-chip PCIe devices (called PEM units in the hardware manuals) on some Cavium ThunderX processors require quirky access methods for the config space of the PCIe bridge. Add a driver to provide these config space accessor functions. Use the pci-host-common code to configure the PCI machinery. Signed-off-by: David Daney <david.daney@cavium.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Arnd Bergmann <arnd@arndb.de>
44 lines
1.5 KiB
Plaintext
44 lines
1.5 KiB
Plaintext
* ThunderX PEM PCIe host controller
|
|
|
|
Firmware-initialized PCI host controller found on some Cavium
|
|
ThunderX processors.
|
|
|
|
The properties and their meanings are identical to those described in
|
|
host-generic-pci.txt except as listed below.
|
|
|
|
Properties of the host controller node that differ from
|
|
host-generic-pci.txt:
|
|
|
|
- compatible : Must be "cavium,pci-host-thunder-pem"
|
|
|
|
- reg : Two entries: First the configuration space for down
|
|
stream devices base address and size, as accessed
|
|
from the parent bus. Second, the register bank of
|
|
the PEM device PCIe bridge.
|
|
|
|
Example:
|
|
|
|
pci@87e0,c2000000 {
|
|
compatible = "cavium,pci-host-thunder-pem";
|
|
device_type = "pci";
|
|
msi-parent = <&its>;
|
|
msi-map = <0 &its 0x10000 0x10000>;
|
|
bus-range = <0x8f 0xc7>;
|
|
#size-cells = <2>;
|
|
#address-cells = <3>;
|
|
|
|
reg = <0x8880 0x8f000000 0x0 0x39000000>, /* Configuration space */
|
|
<0x87e0 0xc2000000 0x0 0x00010000>; /* PEM space */
|
|
ranges = <0x01000000 0x00 0x00020000 0x88b0 0x00020000 0x00 0x00010000>, /* I/O */
|
|
<0x03000000 0x00 0x10000000 0x8890 0x10000000 0x0f 0xf0000000>, /* mem64 */
|
|
<0x43000000 0x10 0x00000000 0x88a0 0x00000000 0x10 0x00000000>, /* mem64-pref */
|
|
<0x03000000 0x87e0 0xc2f00000 0x87e0 0xc2000000 0x00 0x00100000>; /* mem64 PEM BAR4 */
|
|
|
|
#interrupt-cells = <1>;
|
|
interrupt-map-mask = <0 0 0 7>;
|
|
interrupt-map = <0 0 0 1 &gic0 0 0 0 24 4>, /* INTA */
|
|
<0 0 0 2 &gic0 0 0 0 25 4>, /* INTB */
|
|
<0 0 0 3 &gic0 0 0 0 26 4>, /* INTC */
|
|
<0 0 0 4 &gic0 0 0 0 27 4>; /* INTD */
|
|
};
|